Sewing-machine



(No Model.)

A. PARTRIDGE & A.- KITZMILLER.

Sewing Machine. No'. 242,473.

Patented June 7,1881.

NITED STATES PATENT OFFICE...

ANDREV PARTRIDGE AND AROHIBALD KITZMILLER, OF SPRINGFIELD, MASSACHUSETTS.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 242,473, dated June 7,1881.

Application filed September 13, 1880. (No model.)

To all whom it-mag concern:

Be it known that we, ANDREW PARTRIDGE and AROHIBALD KITZMILLER, both citizens of the United States, residing at Springfield, in the county of Hampden and State of Massach usetts, have jointly invented new and useful Improvements in Sewing-Machines, of which the following is a specification.

This invention consists in novel mechanism for operating the shuttle-lever and the feedlevcr of a sewing-machine, and the construction and arrangement of the same will be fully described hereinafter in detail.

Our invention is illustrated in the accompanying drawings, in which Figure 1 is a plan view of the under side of a sewing-machine embodying our invention. Fig. 2 is an isometric view of the under side of the machine. Fig. 3 is a side elevation of one end of the "crtical driving-shaft, the crank-disk, and crankpin, and the feed-lever-connection plate in section; and Fig. 4 is a plan view of said plate.

Like letters refer to like parts in the several figures.

In the drawings, A is the bed of the machine, upon the under side of whichits operative parts directly relating to the shuttle and feed motions are located.

B is the crank-disk, secured to the lower end of a vertical driving-shaft. A crank-pin, a, is fixed in the crank-disk.

The shuttle-lever c is pivoted to the bed of the machine, as shown, and its rear end, over the crank-disk B, is slotted diagonally, and in the said slot, against its long sides, are fitted two plates, 6 e, the latter being secured in a fixed position by screws, as shown, and the former being secured adjustably thereon by making its screw-holes larger than the screws which hold it upon said lever.

Through two bosses, r r, rising up on the edge of the rear end of lever c, are fitted two screws, 0 0, whose inner ends bear against the outer edge of plate 0.

The crank-pin to projects up through the before-mentioned diagonal slot in lever c, and between the adjacent edges of plates 6 e, and plate 0 can, by turning screws 0 0, be so adjusted relative to plate 0 as to cause the slot between them to beef a width so nearly equaling the diameter of pin a as to cause those parts to operate noiseless] y 5 and, furthermore, any wear of crank-pin or plates can be easily taken up by adj listing-plate c, as just described.

By forming the said slot in the sh Little-lever, in which the crank-pin operates, in a direction diagonal to the length of the lever, greater ease of motion is the result, and the crank-pin may be worked nearer the center of crank-disk B, to produce a certain degree of radial movement in the shuttle-carrying end of lever 0 than it could be if it Worked in a longitudinal slot in said lever. Also, by the use of the dia gonal slot, there is less differencein the movements of the shuttle-lever as it passes to and fro by the necdle,and one essential advantage that the diagonal slot affords over the longitudinal one is that the dead-centers of the crank-,inotion are thrown each side of the needle,and the shuttle always passes rapidly by it.

The feed-lever b is hung in a saddle, i, pivoted to the end of a support, (I, which is secured to a slide, it, adapted to operate in a longitudinal groove in bed A in the usual manner, to adjust the degree of lateral movement of the end of the feed-lever, so as to feed forlong or short stitches.

A supplementary piece, I), is secured to lever b by a screw, 2, which passes through an oblong hole in piece I), and screws into piece b, thus providing a means of adjusting the relative positions of the feed-bar f, and theinclined face of the feed-lever directly under it, when more or less lift is required in the feeddog, or when the latter is required to begin its upward movement from a higher or lower point.

If preferred, the feed-lever may be made in one piece, and all the effectof the above-named adjustment be produced by hanging the friction-roller g on an eccentric-pin, and by providin g means for turning said pin to raise or lower the end of the feed-lever which rests on said roller.

The rear end of the feed-lever is secured loosely to a stud, a, as shown, and the lower end of said stud is secured to a connectingplate, 8, and through the latter, near one end, is an oblong hole, 3. The parts just named are connected to the end of crank-pin a, below the plates 0 c, by passing the end ofsaid crankpin through hole 3 in plate 8, and securing said parts one to the other by a nut, as shown. Before finally securing said parts together, however, plate 8 is swung around on pin a to one side of the center of disk B, until stud it stands relatively to the center of said disk in such a position as will give the requisite lateral reciprocating motion to the rear end of the feed-lever, and, swinging it on its fulcrum, saddle 13, cause its end under the feed-bar to impart to the latter the usual transverse feed-motion.

By referring to Fig. 3 it will be seen that plate 8 reaches a certain distance across the center of crank-disk B. Therefore, as disk B revolves stud it gives to the feed-lever which is connected to it a longitudinal reciprocating motion under bed A. The aforesaid longitudinal movement of the feed-lever may be increased or diminished by changing the position of plate 8 on stud n by means of the oblong hole 3 through said plate.

From the foregoing description of the operation of the devices by which the feed-lever is connected to the crank-disk B, it will be seen that the revolution of the latter imparts to said feed-lever the requisite motions which cause it, acting in cooperation with the feed-bar f, to produce the usual four-motion feed.

The above'described devices for producing the requisite lateral and longitudinal motions in the feed-lever of a sewing-machine are such as are effective for their purpose, are easily adjusted to such differences of action as may be required, operate with the least possible amount of friction, and can be very cheaply and economically constructed.

What we claim as our invention is 1. The combination, in a sewing-machine, of a shuttle-carrying lever vibrating on a fixed pivot near its center, below the bed-plate, and provided at its rear end with a straight slot diagonal to the length of the lever, and ahorizontal disk provided with a crank-pin extendin g into said slot, substantially as set forth.

2. The combination, in a sewing-machine, of the shuttle-lever 0, provided with a crank-pin slot of adjustable width formed therein diagonally to the length of said lever, and the crankdisk B, provided with the crankpin a, substantially as set forth.

3. The combination, with the feed-lever ot' a sewing-machine and with the crank-disk B, provded with the crank-pin a, of the stud n and plate 3, substantially as and for the purpose set forth.

4. In a sewing-machine, the combination, with the crank-disk B, provided with the crankpin a, and the feed-lever, of the stud n and the plate 8, provided with the oblong hole 3, substantially as and for-the purpose set forth.

5. The combination, with the crank-disk B, provided with the crank-pin a, of the plate 8, stud n, feed-bar f, and the feed-lever, of adjustable length, substantially as set forth.

6. The combination, with thefeed-lever of a sewing-machine, of the crank-disk B, proyided with the crank-pin a, the plate 8, stud a, and the pivoted saddle 7:, adjustable to different positions under said feedlever, substantially as and for the purpose set forth.

ANDRINV PARTRIDGE. AROHIBALD KITZMILLER.

Witnesses:

WM. H. (JIIAPIN, F. L. SAFFORD. 

